Adjacent angles: Adjacent angles are angles in a plane that have their vertex and one side in common but have no interior points in common.
external image AdjacentAngles.png
a statement that has "if" and "only if" is called a "biconditional statement".
Deductive Reasoning: Uses facts, definitions, and properties in a logical order to write an arguement.
Law Of Detachment: If p-q isa true statement and p is true, then q is true.
Ex: If the measure of two angles equals 90 degrees(45,45), then the angles are complementry.